Some MLAs can have dual responsibilities as both MLA and minister. This can happen because
a. The MLA belongs to the party that has majority support in the state legislature.
b. The leader of that party is appointed as Chief Minister who then selects the MLA as a minister.
c. The MLA then needs to perform the executive role associated with a minister. Simultaneously, he also needs to perform his legislative role in the state assembly. Thus, he has to perform in the law making process as a MLA and in the implementation of those laws in his capacity as a minister.